[App_rpt-users] Multiple PL tones

Kevin Custer kuggie at kuggie.com
Fri Feb 8 15:55:47 EST 2019


Marty,

Multiple CTCSS tone encoding/decoding is available in the usbradio 
channel driver.  To properly use this channel driver, you must deliver 
raw discriminator audio into the radio adapter.  You must also drive the 
TX modulator with the encode tone.  A complete explanation of this is 
beyond the scope of this email.

It is NOT currently recommended to use the CM119B based radio adapters 
with usbradio because of several issues.  Use an older URI, URIx or 
other radio adapters that still use the CM119A.

The minimum number of changes to the CTCSS stanza in the usbradio.conf 
file looks like this:

carrierfrom=dsp
ctcssfrom=dsp
rxdemod=flat
txctcssdefault=88.5    ; Tx CTCSS Default Encode
                                     ; Encodes this tone if no other 
tone in use.

rxctcssfreqs=88.5, 103.5, 123.0, 186.2        ; rx ctcss frequency. this 
must be in the tone table.
txctcssfreqs=88.5, 103.5, 123.0, 186.2        ; tx ctcss frequency. any 
frequency is permitted.

Basically, if you come in on 88.5, the repeater will encode 88.5. If you 
come in on another frequency, you'll encode that frequency, if 
everything is defined correctly.  There are timing parameters that can 
be 'buggy', but it does work to some degree.  You can use any of the 
CTCSS tones defined in the table.

Kevin W3KKC



On 2/8/2019 7:34 AM, Marty wrote:
> I have a question about using multiple PL tone.
> I have a guy that is using two usb interfaces per Pi to control his 
> radio sorta like TalkGroups or an Zedtron
> controller would work like as a Community repeater.
> Have any idea what I'm talking about? And yes he is using ASL on his 
> system.
>
> 73,
> Marty KD4HLV
> ASL-Node 28523



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